/// <summary>
/// Calculates a weighted Centroid for a given array of __inputVecType__s
/// </summary>
public static __outputVecType__ ComputeCentroid(this __inputVecType__[] vectors, __scalarType__[] weights)
{
__outputVecType__ sum = __outputVecType__.Zero;
__scalarType__ weightSum = 0;
for (int i = 0; i < vectors.Length; i++)
{
sum += weights[i] * __cast__vectors[i];
weightSum += weights[i];
}
return(sum / weightSum);
}
/// <summary>
/// Calculates a weighted centroid for vectors and weights given by indices.
/// Sum(vectors[indices[i]] * weights[indices[i]]) / Sum(weights[indices[i]].
/// </summary>
public static __outputVecType__ ComputeCentroid(this __inputVecType__[] vectors, __scalarType__[] weights, int[] indices)
{
__outputVecType__ sum = __outputVecType__.Zero;
__scalarType__ weightSum = 0;
for (int i = 0; i < indices.Length; i++)
{
var w = weights[indices[i]];
sum += w * __cast__vectors[indices[i]];
weightSum += w;
}
return(sum / weightSum);
}
